JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
<div class="child"></div>
</div>

CSS

.parent{
    width:200px;
    height:200px;
    border:1px solid red;
    position:relative;
}
.child{
    width:100px;
    height:100px;
    background:blue;
    position:absolute;
    top:0;
    right:0;
}